<!DOCTYPE html>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/bluetooth/resources/bluetooth-test.js"></script>
<script src="/bluetooth/resources/bluetooth-fake-devices.js"></script>
<script>
'use strict';
bluetooth_test(() => {
  let char;
  return setBluetoothFakeAdapter('HeartRateAdapter')
    .then(() => requestDeviceWithTrustedClick({
      filters: [{services: ['heart_rate']}]}))
    .then(device => device.gatt.connect())
    .then(gattServer => gattServer.getPrimaryService('heart_rate'))
    .then(service => service.getCharacteristic('heart_rate_measurement'))
    .then(characteristic => {
      char = characteristic;
      return assert_promise_resolves_before_event(characteristic,
                                                  'startNotifications',
                                                  'characteristicvaluechanged',
                                                  3 /* add 3 listeners */);
    })
    .then(() => char.stopNotifications())
    .then(() => assert_no_events(char, 'characteristicvaluechanged'));
}, 'Add multiple event listeners then startNotifications().');
</script>
